Conventional suture with prolonged timing of drainage is as good as quilting suture in preventing seroma formation at pectoral area after mastectomy

Table 2 Binary outcome comparisons

		Quilting suture (group 2) n=116	Conventional suture (group 2) n=139	Conventional suture (group 3) n=133	p value
Seroma (grade 1, early)	n (%)	14 (12.1)	12 (8.6)	12 (9.0)	0.612
Seroma (grades 2–3, early)	n (%)	6 (5.2)	7 (5.0)	5 (3.8)	0.837
Seroma (grade 1, late)	n (%)	7 (6.0)	9 (6.5)	6 (4.5)	0.767
Seroma (grades 2–3, late)	n (%)	5 (4.3)	4 (2.9)	2 (1.5)	0.412
Seroma (grade 1)	n (%)	21 (18.1)	21 (15.1)	18 (13.5)	0.780
Seroma (grades 2–3)	n (%)	11 (9.5)	11 (7.9)	7 (5.3)	0.437
Seroma	n (%)	32 (27.6)	32 (23.0)	25 (18.8)	0.258
Hematoma	n (%)	5 (4.3)	5 (3.6)	3 (2.3)	0.654
Surgical site infection	n (%)	4 (3.4)	2 (1.4)	2 (1.5)	0.251
Inadequate wound healing	n (%)	2 (1.7)	2 (1.4)	3 (2.3)	0.580

Discrete variables used χ² test or Fisher exact test. Outcome comparisons among the three groups. The incidence of grades 2 and 3 seroma or late seroma in grades 2 and 3 was similar among the three groups (p = 0.437 and p = 0.412 respectively). The incidence of grade 1 seroma was comparable among the three groups (p = 0.780)

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